/**
 * Copyright (C) 2001-2020 by RapidMiner and the contributors
 * 
 * Complete list of developers available at our web site:
 * 
 * http://rapidminer.com
 * 
 * This program is free software: you can redistribute it and/or modify it under the terms of the
 * GNU Affero General Public License as published by the Free Software Foundation, either version 3
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License along with this program.
 * If not, see http://www.gnu.org/licenses/.
*/
package com.rapidminer.tools.math.kernels;

/**
 * This is the interface describing the kernel cache.
 * 
 * @author Ingo Mierswa
 */
public interface KernelCache {

	/**
	 * Stores the value. Should only be invoked if the value was not known. This method might delete
	 * kernel values so that the invocation of get might deliver NaN.
	 */
	public void store(int i, int j, double value);

	/** Delivers the cached value or Double.NaN if the value is not known. */
	public double get(int i, int j);

}
